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Eric Colvin

macrumors newbie
Original poster
Jun 12, 2013
5
0
Osaka
Hi,

though not in any way technical, I've been using Mac since the earliest prototypes. I'm pretty sure I remember a time when it was possible to maintain two systems on the same drive and choose which one you were going to boot from. Maybe I'm wrong and it was a matter of partitioning.

I am now keeping alive (with upgraded RAM and SSDs) an old MacBook Air and iMac, running High Sierra — and an even older 2009 MacBook Pro, running El Capitan (the latest system which it is sanctioned to run).

I can use any of the three to work on my key projects, and I backup to TimeMachine and to clones.

The frustrating part is that, despite their containing near identical directories, folders and files, I can only boot from the clone that is bespoke for each computer — which makes more of a headache out of keeping my working files and settings up to date on each.

I just wondered, is there any way I could set up any of my external hard drives with two (or more) operating systems?

If need be, could I somehow use small partitions for the separate systems but have them refer to a single HD Data partition for the apps, system settings, and other things which the computers could have in common? That way, I could travel with one external hard drive, keep it up to date, and have the option to boot to another computer if anything went wrong.

I haven't thought this through carefully — let alone tried it out. I just wondered whether someone might already have similar experience and found an elegant solution.

Thanks for your thoughts,



Eric
 
Last edited:
I used to do this with partitions.

But... these days... the cost of small SSD's has dropped to the point where one can buy a 120gb SSD for about $25.

So... I keep "other versions of the OS" on other... drives.

Makes it easier to boot from and to maintain them that way.

And no worries about "partition troubles"...
 
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